Boring machine



March 23, 1937. r L E, O 2,074,426

BORING MACHINE Filed March 20, 1930 5 Sheets-Sheet 1 6 5 a 3 g E E E gggS g 6 g E Q .52 .52 I as 466 11 42 4 z FLQJ 41 ruin March 23, 1937. 1.. E. POOLE BORING MACHINE 5 Sheets-Sheet 3 Filed March 20, 1930 March 23, 1937. L. E. POOLE 2,074,426

BORING MACHINE Filed March 20 1930 5 Sheets-Sheet 4 Z5 lfo March 23, 1937: L E. POOLE BORING MACHINE Filed March 20, 1930 5 Sheets-Sheet 5 A o g 545 r. WV

Patented Mar.-

BORING MACHINE Lora E. Poole, Anderson, Ind., assig'nor, by mesne assignments, to General Motors Corporation, Detroit, Mich a corporation of Delaware Application March 20, 1930,. Serial No. 437,478

15 Claims.

This invention relates to the subject of auto- 'matic drilling or boring machines and particularly to machines for boring or machining a cylindrical surface on the interior of a tubular 5 member.

It is an object of the present invention to provide a machine of rugged and durable construction for machining the interior of tubular bodies.

A further object of the invention is to provide for automatically controlling the operation of the boring machine in a manner such that all of the operations are performed automatically when once the machine has been set into operation by the manipulation of a singlecontrol member and 15 such that the machine will stop automatically and return to normal position when the piecehas been machined and the work holder or chuck holding the work piece will automatically release the work and permit it to fall from the chuck 20 by gravity.

invention will be apparent from the followin description, reference being had to the accompanying drawings, wherein a preferred embodiment of one form of the present invention is clearly shown.

In the drawings:

Fig. 1 is a perspective view showing portions of the right side and front elevations of the machine embodying the present invention.

Fig. 2 is a perspective view showing portions of the left hand side and front of the machine.

Fig. 3 is a fragmentary side elevation partly in vertical longitudinal section.

Fig. 4 is a sectional view on the line fl-t of Fig. 3.

Fig. ,5 is a plan view of the work holder or chuck taken on the line 5-5 of Fig. 3. Fig. 5

is partly in section taken on the line Sit-5a of Fig. 6. Fig. 6 is a sectional view on the line 6-6 of Fig. 5. Fig. 7 is a sectional view on the of Fig. 3. a Fig. 8' is a'front elevation of the control apparatus for themachin'e. r

' Fig. 9 is a side view thereof looking in the direction of the arrow 9 of Fig. 8. V

Fig. 10 is a plan view of the apparatus .partly 0 in section taken on the line Ill-J0 of Fig. 8'.

Fig. 11 is a sectional view on the line I l-I| of Fig. 8. Fig. 12 is a' longitudinal sectional view taken on the line l2'-l2 of Fig. 8. and l2a.-l2w of 55 Fig. 5, and shows the control apparatus in posiline 1-1 Further objects and advantages of the present 1 tion for returning the boring machine to normal position and for releasing the work from the chuck. j

Fig. 1-3 is a view -similar to Fig. .12 Showing the control apparatus in position for causing the 5 chuck to grip the work and the boring apparatus to operate-uponthe work. r

The boring machine comprises a base 20, whic supports a frame 2!, having spaced brackets 22 which cooperate to support an integral cylinder 10 23 and bearing members 23, to which a detachable bearing member 25 is secured by screws 26. The members 24 and 25 cooperate to laterally support and guide a spindle frame 30, of rectangular external contour supporting at its upper end a gear. box 3| upon the upper side of-which a motor 32 is attached. Motor 32 drives a shaftfit car ying a gear 34 which meshes with a gear 35 attached to a shaft 36 journalled in abearing 31,

provided by the gear box 3! and in a bearing 38 provided by the gear box cover 39, which provides the supporting base for themotor 32. a The shaft 36 drives a gear 40 meshing with a gear attached to the upper end of a boringshaft or spindle t2 journalled in tapered roller bearings 43 and 44, secured to the spindle'frame in proper manner as clearly shown in Fig. 3.

The spindle frame 30 provides a rack 56 meshing with a gear 5| attached to a shaft 52 :Iour-" I nalled in bearings 53 provided by the brackets 22. 30 The gear 5i meshes with a rack 5% attached to a vertically movable counterweight 55 which is guided during its vertical movement by rollers 56 journalled on the heads of screws 51 attached tothe brackets 22. Eachbracket carries two pairs of rollers 56 and the rollers of each pair are spacedapart so as to receive between them a rib 58 provided by the counter-weight 55. The mass of the counter-weight 55 is suiilcient to overbalance the mass of the frame 30 and parts carried thereby so that the spindle frame 30 tends to return to upward position.

' The spindle frame. 30 is caused to descend by admitting a suitable fluid under pressure such as oil into the cylinder 23 between its cover 60 and 1 a piston 6! attached to'a piston rod 62 connected liquid used to lubricate and cool the work and boring bits.

The chuck n which is shown in detail in m. as

5 and 6, comprises a frame 1|, having a cylindrical bore 12 which receives chuck jaw frames 13 and 14, having cylindrical peripheries in which gear segments 15 and 16 respectively are cut. 5 Segments '15 and 16 mesh with racks 11 and 18 respectively, attached by rods 19 and 80 respectively, to pistons 8| and 82 respectively, slidable in cylinders 83 and 84 respectively, provided by cylinder block 85, clamped between end plates 86 the valve body I30 and has valves I35 and I36 for controlling ports I31, I38, I39, and I40 connected respectively with pipes I4I, I42, I43, and I44. Pipe MI is connected with branch pipes I4Ja and cylinders 83 and 84 respectively. Pipe I42 is connected with a sort of fluid under pressure. Pipe I43 is connected with branch pipes I43a and H312 communicating with the lefthand ends of located in' non-clamping position. To use the machine, the operator will pass a work piece A upwardly through the central opening in the chuck until the work piece strikes a stop plate 681:, attached to the bracket 68, as shown in Fig. 3. While maintaining the piece A in this position with one hand, the operator pulls down on a handle I60, thereby causing a lever 'I6I, pivoted at I62 upon the plate III, to move into the position indicated in dot and dash line |6|a. The lever, being connected by a pin I63 to a bifurcated block I64 attached to the valve rod I I6, will cause the valve rods I I6 and I34 to move from the positions shown in Fig. 12 to those shown in Fig. 13. These valve rods will be held in these positions by a latch I65, attached to a lever I66, pivoted at I61 upon the plate III, and urged by spring pressed plunger I68 in a clockwise direction so that the latch I65 will engage the under-side of the lever |6| to hold it in the dot-dash line position |6Ia. Movement of the valve rod I I6 into the position shown in Fig. 13 will cause the upper end of the cylinder 23 to be connected with the high pressure pipe I24 as indicated by arrows I10, |1I, I12, and I13 in order to' cause the piston 6| to move downwardly, as indicated by arrows I14. The movement of the valve rod I34 into the position shown in Fig. 13 will cause the high .pressure pipe I42 to be connected with the left chuck frames 13 and 14 will take place in the direction of the arrow |0|, thereby causing the chuck jaw projections 94 to ride progressively toward portions of, the cams 95 which are more re-& 40 mote from the center-of the chuck, whereupon the jaws will recede from the work piece A to permit the same to descend by gravity into the container I02, shown in Figs. -1 and 2.

The control of the admission of pressure flui 45 to the cylinders 23, 83, and 84 will now be described with reference to Figs. 8 to 13 inclusive. To the front face 0 of the spindle frame over and guide member 25, there is secured'a plate III shown in Figs. land 2, 8 to 13, inclusive, but omitted from Figs. 3 and 4. The plate III sup ports a valve body 2 to which end.members H3 and 4 are secured, said end members pro-- viding brackets by which the body I I2 is attached to theplate III. The plate III supports a valve body 30 having end members I3| and I32 which are used to attach the body I30 to the plate III. The body 2 is provided with a central bore 5 and the body I40 with a central bore I33 in alignment with the bore H5. The body 2 receives a valve rod 6 providing cylindrical valves 1 and 8 for controlling po II9, I20, and I2I connected respectively wit, pipes I22, I23 and I24. A spring I25 tends to maintain thevalve rod I liinupper position shown 65 in Fig. 12. The pipe I23 is connected with the hand end of the cylinders 83 and 84 as indicated cylinder 23 between the piston 6| and the cylinby arrows I15, I16, and I11, in order to cause der head 60. The pipe |22 returns the pressure the pistons 8| and 82 to move toward the right as fluid to the low pressure side of a compression indicated by arrows I18. Consequently, the work pump. Pipe I24 is connected with the high prespiece A will be clamped in the chuck while the 70 sure side of a compression pump or reservoir of spindle frame 30 descends due to the force exerted upon the upper side of the piston 6|, as indicated by arrows I14. As the frame descends, the rotating spindle 42 will cause the tools 66 to machine a cylindrical surface upon the interior of the work piece A;

fluid under pressure. s

The spring I25, which lifts the valve II6, surrounds a rod I26 attached to the valve 8 and adapted to transmit downward movement from 7 valve 8 to a valve rod I34 which slides through I4I-b communicating with the right ends of the 10 and 81, with screws 88 secured to the frame 1| the cylinders 83 and 84.respectively. Pipe I44 The chuck jaw frame 13 is confined between the leads back to a liquid reservoir open to the atmosjaw frame 14 and the bracket 68'. The chuck jaw phere or to the low pressure side of a compression frame 14' is confined between the jaw frame 13 pump. The valve rod I34 is normally maintained and the bottomv plate 89, secured by-screws 90, in elevated position shown in Fig. 12, by a spring 5 to the frame 1|. Each of the jaw .frames 13, 14 I surrounding a rod I46 attached to the valve is provided with radial notches 9| each of which rod I34. The valve rod I34 is provided with a guides for radial movement a chuck jaw 92, havcentral passage I41 communicating with side pasing teeth- 93 for gripping the 'work piece A and sages I48 and I49. When the valve I34 moves having a projection 94 cooperating with a staupwardly, these passages provide for the trans- 20 tionary camming surface 95, provided by the fer of liquid from that portion of-the valve housframe 1|. The projections 94 are normally urged ing I30 which is above the valve I35 to that poragainst the cams 95 by leaf spring members 96, tion of the valve housing I30 which is below the each attached by screws 91 to one of the chuck -valve I36, and vice versa, when the valve I34 jaw frames and each extending from a screw 91- moves downwardly.

25 through a knot 98 provided in the chuck jaw Normally, the valve rods 6 and I34 are in frame and into a recess 99 provided in the chuck upper position as shown in Figs. 8, 9, and 12. jaw. When the pistons 8| and 82 move toward When the valves are in this position, the upper the right as viewed in Figs. 5 and 13, the frames end of the cylinder 23 is connected with the liq- 13 and 14 will rotate in the direction of the arrow uid drain pipe |22 as indicated by arrows I50,

30 I00, thereby causing the chuck jaw projections 94 ISI, I52, and I 53. Likewise, the right hand ends to ride along those portions of the cams 95 which 7 of the cylinders 83 and 84 are connected with the are nearer to the center of the chuck, thereby high pressure supply pipe I 42, as indicated by causing the work pieceA to be firmly gripped by arrows I54, I55 and I56, to cause the pistons 8| the jaws 92. When the pistons 8| and 82 move and 82 to move toward the left, as indicated by 35 toward the left as in Fig. 12, the motion of the arrows I51, thereby causing the chuck jaws to be After. the tools 66 have descended below the work piece A, the spindle frame 36' will be caused to ascend automatically, but the, chuck III is not automatically released until after the tools 66 have ascended above thework piece. Referring to Figs. -8, 9, and 11, it will be noted-that alatch bar I80 slidable in a bracket I8 I, is urged by a spring I I82 toward the right against the valve rod I34.

When the rod I34 is moved into the position shown in Fig. 13 by the downward movement of the rod I26, the latch I86 will move into the position indicated by dot and dash line I8Ila in Fig. 8, so that it will be over the upper end of the valve rod I34 when in the position shown in Fig. 13 and will bear against the rod I26 when in the position shown in Fig. 13 or in the dot-dash line position I 26a shown in Fig. 8. The gear housing 3| carries a bracket I83 from which a rod I84 is suspended, said rod being guided by a bracket I85 attached to the plate III. The rod I84 carries collars I86 and I81 which are adjustably secured to the rod I 86. By the time the tools 66 have descended below the work piece A, the collar I66 will have descended slightly below the position I86a shown in Fig. 8, in order to engage the latch lever I66 andto cause it to move'counterclockwise in order to move the latch I65 away from the lever I6I whereupon the spring I25 in the valvehousing II! will cause the rod I I6 to move upwardly carrying with it the lever i6l, which moves from position i6Ia into the normal position shown infull lines in Fig. 8. The return of the valve rod M6 to normal position will cause the pressure upon the upper side of the piston 6| to be released and the pressure fluid to flow from the cylinder 23 in the manner indicated by arrows I58, II, B62, and I53, The counter-weight 55, being heavier than the spindle frame 30 and parts carried I a knot I93 in the latch bar I86, to move said latch bar toward the left so that it will be out of alignment with the upper end of the valve rod I34, whereupon the spring I65 in the housing I30, will be permitted to return the valve rod I36 into the position shown in Fig. 12. When this occurs, the pistons 8i and 82 will move from the position shown in Fig, 13 to the position shown in Fig. 12, thereby retracting the chuck jaws from the workpiece and permitting the work piece to descend by gravity into a receptacle I02 shown required to move them into clamping" position.

When the clamps are moved into clamping position, the frictional resistance .encountered between the projections 94 of the chuck jaws 92 and the cams 95, is a sliding friction, the coeflicient of which is less than the coefficient of static friction to be overcome first, before the chuck jaw frames I3 and I4 can be started rotating in a counterclockwise direction, as viewed in Fig. 5 to effect release of the chuck jaws.

If for any reason it is desired to stop downward movement of the boring spindle while in operation, the operator may pull a handle 260 downwardly to cause the lever I66 to move into a position for releasing the lever I6I, whereupon the spindle frame 36 will ascend and the work piece will be automatically released from the chuck. 1 x

While the form of embodiment of the present invention as herein disclosed, constitutes a preferred form, it is to be understood that other .forms might be adopted, all coming within the a scope of the claims which follow.

What is claimed is as follows:

1; A boring machine comprising, in combination, a workholding chuck; a tool carrying spindle movable toward and away from the chuck; fluid pressure operated means for advancing the spindle toward the work;- gravity means for retracting the spindle; a supply of fluid pressure; a first control means normally urged into a position in which ,to intercept communication between the fluid supply and the spindle advancing means; manually operable means for shifting the control means into communicating position; means for arresting the control means in communicating position; power means for causing the vchuck to grip the work; a second control means operated by the movement of the flrstcontrol means into communicating position for rendering the power means effective; means adjustably carried by the spindle for disengaging the arresting means from the first control means upon engagement with the same; and means for operating the second control means so as to render the power means inefiective.

2. A boring machine comprising, in combination, a workholding chuck; a tool carrying spindle movable toward and away from the chuck; fluid pressure operated means for advancing the spindle toward the work; gravity means ferretracting the spindle; a supply of fluid pressure; a first control means normally yieldingly urged into a position in which to intercept communication between the fluid supply and the spindle advancing means; manually operable means for shifting the control means into communicating position; means for arresting the control means in communicating position; power means for causing the chuck to grip the work; asecond control means operated by the movement of the first control means into communicating position for rendering the power means effective, and

operated by the retracting spindle for rendering the power means ineffective; and means adjustably carried by the spindle for disengaging the arresting means from the first control means upon engagement with the same.

3. A boring machine comprising,- in combination, a workholding chuck; atool carrying spindle movable toward and away from the chuck; fluid pressure operated means for advancing the spindle toward the work; gravity means for retracting the spindle; a supply of fluid pressure; a first control means normally yieldingly urged into a position'in which to intercept communica- .tion between the fluid supply and the spindle advancing means; manually operable means for -shifting the control means into communicating position; means forarresting the control means in communicating position; fluid pressure'operated means for causing the chuck to grip the work; a second control means yieldingly urged into a position in which to intercept communication between the fluid supply and the last said fluid pressure operated means. and shifted into communicating position by the first control means when moving into communicating position; means arresting the second control means in communicating position; means adjustably carried by the spindle for disengaging the arresting means from the first control means upon engagement with the same; and means for disengaging the arresting means from the second control means. 7

4. A boring machine comprising, in combination, a workholding chuck; a tool carrying spindle movable toward and away from the chuck; fluid pressure operated means for advancing the spindle toward the work; gravity means for retracting the spindle; a supply of fluid pressure; a first control means normally yieldingly urged into a position in which to intercept communication between the fluid supply and the spindle advancing means; manually operable means for shifting the control means into communicating position; means for arresting the control means in communicating position; fluid pressure operated means for causing the chuck to grip the work; a second control means yieldingly urged gagement with the same.

:5. A boring machine 'comprisi g, in combine tion a machine frame, a work holding chuck; a

tool-carrying. spindle movable axially toward or away from the chuck, means for axially moving the spindle, means for operating the chuck, a controller operable to cause the chuck to grip and release thework, another controller operable to cause the spindle to move toward the work; manually operated means to actuate both controllers simultaneously in order simultaneously to close the chuck and to start the spindle toward the 'work; and automatic means for stopping the movement of the spindle toward the work and for causing the spindle to recede and for causing the chuck to release the work after the tool fpn the spindle completely retracted from the work, said automatic means including a plurality Qf relatively movable coacting parts carried respectively by the mabhine frame and the spindle,

, e parts carried by the spindle being adjustable hereon and devices operatingiupon each controller in response to the ccaction of said parts. r 6. A boring machine comprising, in combination, a machine frame; a work holding chuck, a tool-carrying spindle movable axially toward or away-from the chuck, means for axially moving the spindle, fluid pressure means for operating the chuck, a controller operable to cause the fluid pressure means to open and close the chuck; another controller operable to cause the spindle to move toward the chuck; manually operated means to operate both controllers simultaneously in order simultaneously to eifectclosing of the chuck and to start the spindle toward the work; and automatic means for stopping the movement of the spindle toward the work and causing the spindle to recede, and for causing the fluid presnu'e operated means to open the chuck to release adjustable thereon and devices operating upon each controller in response to the ccaction of said parts.

7. A boring machine comprising, in combination, a machine frame; a work holding chuck, a tool-carrying spindle movable axially toward or away from the chuck, fluid pressure operated means for causing the spindle to move toward the chuck, fluid pressure means for operating the chuck; yielding means for retracting the spindle; a controller operable to cause the fluid pressure means to open and close the chuck; another controller operable to cause the fluid pressure operated means to move the spindle toward the work; manually operated means to actuate both controllers simultaneously in order simultaneously to cause the fluid pressure means to close the chuck and to cause the fluid pressure operated means to start the spindle toward the work; and automatic means for causing the fluid pressure operated means to stop movement of the spindle toward the work and to render the fluid pressure erating upon each controller in response to the ccaction of said parts.

8. A boring machine comprising, in combination, a machine frame; a work holding chuck, a

tool-carrying spindle movable axially toward ,or'

away from the chuck, means for axially moving the spindle, means for operating the chuck, a

controller operable to cause the chuck to grip and release the work; another controller operable to cause the spindle to move toward the work; manually operated means to actuate both controllers= simultaneously in order simultaneously to close the chuck and to start the spindle toward the work; automatic means for stopping the movement of the spindle toward the work and for causing the spindle to recede and the chuck to release the work after the tool on the spindle completely retracted from the work, said automatic means including a plurality of relatively movable coacting parts carried respectively by the machine frame and the spindle, the parts carried by the spindle being adjustable thereon and devices operating upon each controller in response to the ccaction of said parts; and manually operable means for operating certain'of said parts on the machine: frame at will thereby effecting interruption of the movement of the spindle toward the work at will. I v

9. A boring machine comprising, in combination, a workholding chuck; a tool-carrying spindle; means for causing relative movement between the spindle and the chuck; means for op-" means for actuating said second controller for I causing relative movement between the spindle and chuck in the other direction; and means for actuating the first controller for causing the chuck to release the work.

10. In material working apparatus, a multiv sided sleeve having oppositely disposed bearing surfaces, a rotatable spindle within said sleeve, means for rotating said spindle, a mounting having oppositely disposed bearing surfaces for receiving and guiding the bearing surfaces of said sleeve to thereby secure said sleeve against lateral displacement and torsion, said sleeve being adapted for reciprocation within said mounting to effect the translation of said spindle, a reciprocable hydraulic actuator including a piston and cylinder construction for imparting translation to said sleeve,.said sleeve extending in the direction of travel of said actuator and-cooperating to maintain the alinement of said actuator during the operative functioning thereof, and means carried by said sleeve as a unit thereof and rigidly connecting said sleeve with said actuator.

11. In material working apparatus, a multisided reciprocable sleeve for internally supporting a spindle, a rotatable spindle in said sleeve, means for rotating said spindle, a hydraulic actuator including a piston and cylinder construction for imparting reciprocation to said sleeve, and a unitary mounting for maintaining the alinement of said hydraulic actuator and said sleeve during the longitudinal translation thereof, said mounting forming a portion at least of the cylinder structure of the actuator whereby to present a compact, rigid unitary construction.

12. In material working apparatus, a rnultisided sleeve having oppositely disposed bearing surfaces, a rotatable spindle within said sleeve,

means for rotating said spindle, a mounting having oppositely disposed bearing surfaces for receiving and guiding the 'bearing surfaces of said sleeve to thereby securesaid sleeve against lateral displacement and torsion, said sleeve being adapted for reciprocation within said mounting to efiect the translation of said spindle, a reciprocable hydraulic actuator including a piston and cylinder construction positioned laterally of said sleeve fbr imparting reciprocation thereto, the multi-sided sleeve extending in the direction of travel of said actuator and cooperating to maintain the alinement of said actuator dur-- ing the operative functioning thereof and means carried by said sleeve as a unit thereof and rigidly connecting said sleeve with said actuator.

13. In material working apparatus, a multisided sleeve having oppositely disposed bearing surfaces, a rotatable spindle within said sleeve, means for rotating said spindle, a mounting having oppositely disposed bearing surfaces for receiving and guiding the oppositely disposed bearing surfaces of said sleeve to thereby secure said sleeve against lateral displacement and torsion, said sleeve being-adapted for reciprocation within said mounting to'effect the translation of said spindle, means for securing said sleeve within said mounting, a hydraulic actuator positioned adjacent and laterally of said sleeve, said sleeve extending in the direction of travel of said actuator and cooperating to maintain the alinement of said actuator during the operative functioning thereof and means carried by said sleeve as a unit thereof and rigidly connecting said sleeve with said actuator.

14. In, material working apparatus, a multisided sleeve having oppositely disposed bearing surfaces, a rotatable spindle within said sleeve, means for rotating said spindle, a mounting having oppositely disposed bearing surfaces for receiving and guiding the bearing surfaces of said sleeve to thereby securesaid sleeve against lateral displacement and'torsion, said sleeve being adapted for reciprocation within said mounting to effect the translation of said spindle, a hydraulic actuator including a cylinder and a piston reciprocable therein for imparting translation to said spindle, said actuator being positioned laterally oi andin substantial parallelism with the axis of said spindle, the sleeve cooperating to .maintain the alinement of said actuatorframe, a multi-sided sleeve reciprocably mounted within said unitary frame and having bearing surfaces adapted to be received and guided by the bearing surfaces of said frame, said sleeve being spaced from and arranged in substantial parallelism with the axis of said actuator piston,

a spindle rotatably mounted within said sleeve,

a rigid connection between said sleeve and said actuator, and means for imparting rotation to said spindle.

' LORA E. POOLE. 

